Padlock



FIG. 1 is a front view of a padlock;

FIG. 2 is a left-side view of the padlock;

FIG. 3 is a bottom view of the padlock;

FIG. 4 is a top view of the padlock;

FIG. 5 is a right-side view of the padlock; and,

FIG. 6 is a back view of the padlock.

Broken lines are included to show portions of the padlock that form no part of the claimed design. 

CLAIM The ornamental design for a padlock, as shown and described. 